I cannot reproduce this problem:
C:\Rocco\poe\poe>perl -v
This is perl, v5.10.1 built for MSWin32-x86-multi-thread
(with 2 registered patches, see perl -V for more detail)
Copyright 1987-2009, Larry Wall
Binary build 1006 [291086] provided by ActiveState
http://www.ActiveState.com
Built Aug 24 2009 13:48:26
Perl may be copied only under the terms of either the Artistic License
or the
GNU General Public License, which may be found in the Perl 5 source kit.
Complete documentation for Perl, including FAQ lists, should be found on
this system using "man perl" or "perldoc perl". If you have access to the
Internet, point your browser at
http://www.perl.org/, the Perl Home Page.
C:\Rocco\poe\poe>perl t\90_regression\broeren-win32-nbio.t
1..2
ok 1 - we have a subprocess
# next [3]
# received data from subprocess: [child [-728] read: Can you hear me 3]
# next [2]
# received data from subprocess: [child [-728] read: Can you hear me 2]
# next [1]
# Trying to kill [-728]
# received data from subprocess: [child [-728] read: Can you hear me 1]
ok 2 - child has exited when the counter ran out
C:\Rocco\poe\poe>